int swoole_system_random(int min, int max)
{
static int dev_random_fd = -1;
char *next_random_byte;
int bytes_to_read;
unsigned random_value;
assert(max > min);
if (dev_random_fd == -1)
{
dev_random_fd = open("/dev/urandom", O_RDONLY);
if (dev_random_fd < 0)
{
return swoole_rand(min, max);
}
}
next_random_byte = (char *) &random_value;
bytes_to_read = sizeof(random_value);
if (read(dev_random_fd, next_random_byte, bytes_to_read) < 0)
{
swSysError("read() failed.");
return SW_ERR;
}
return min + (random_value % (max - min + 1));
}
void swoole_random_string(char *buf, size_t size)
{
int i;
for (i = 0; i < size; i++)
{
buf[i] = characters[swoole_rand(0, sizeof(characters) - 1)];
}
buf[i] = '\0';
}
